JPH02297376A - Collecting reservoir for liquid - Google Patents

Abstract

PURPOSE: To enhance reliability by holding a lever at its seal-releasing position, while a fluid remains at a given level in a reservoir and by making again the outlet seal subsequently after releasing the lever. CONSTITUTION: A controller 16 is provided with a float moving in corresponding to a level of fluid in a reservoir, a lever 38 including a means to seal the fluid flowing out through a reservoir outlet 18, and a means to move the lever to a position of releasing the reservoir outlet seal. It holds the lever at its seal releasing position, while a given lever of fluid remains in a reservoir 10, and makes the outlet seal formed again subsequently after releasing the lever. This can use an ensured force to bring the outlet controller 16 up to the fluid sealing position at a give level of fluid to prevent any air from entering into the supply piping system for patients, thus enhancing the reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to fluid flow control devices, and more particularly to devices for controlling fluid flow exiting a fluid refurbishment reservoir. The device of the invention is suitable for controlling the flow of blood from a blood collection transfer reservoir.

Conventionally, the market has provided a number of direct full cardiotomy reservoirs and methods of using the reservoir during blood collection and then returning it to the patient. Typical systems use negative pressure to collect blood into a reservoir and use gravity to return the collected blood to the patient. Roller pumps or intravenous pumps are used in place of gravity when returning blood to increase the rate at which collected blood returns to the patient. Other techniques use positive pressure when returning blood collected from a patient to the patient and when supplying donor blood to the patient. In either case, great care must be taken to prevent air from entering the blood returned to the patient, as the presence of air could result in air embolism and be dangerous to the patient.

An example of a blood collection and supply device is described in US Pat. No. 3,896,733. This device has two blood collection chambers with a float valve that is moved by the blood level in the chamber.

The operation of the float valve is controlled solely by the rise and fall of the blood level in the room. Specifically, when the fluid in the chamber reaches the level of the valve seat at the bottom of the chamber, the valve engages the valve seat and blocks flow from the chamber. The valve should be in the form of a floating disk to prevent air from entering the house exit. When fluid is introduced into the chamber, the float valve rises with the fluid level.

A disadvantage of the fluid outflow control device described above is that when the floating disk is not securely seated, air will flow into the patient via the outlet tubing.

Causes of incorrect seating include tilting of the floating disk due to material build-up on the valve seat, and material build-up on the chamber walls. Clotted blood can also cause disc tilt, leading to incomplete exit seals. Due to the complex properties of blood, an undesirable phenomenon occurs in which air enters the tubing to the patient. This is particularly true when float valves are actuated solely by fluid level and there is no means to reliably press the valve against the valve seat.

BLOOD LOWER CARE A primary object of the present invention is to provide a reliable reservoir fluid outlet control device suitable for controlling blood outflow from a blood collection reservoir and releasably sealing the reservoir outlet. A reservoir outlet control device according to the present invention uses positive force to place the outlet control device in a fluid sealing position at a predetermined fluid level;
Prevent air from entering patient supply tubing.

A reservoir outlet control device for a fluid collection reservoir according to the invention includes a housing having an inlet, a collection chamber, an outlet, and means for controlling fluid flow from the outlet. lever means including float means for moving in response to the level, means for sealing fluid flow through the reservoir outlet, and means for not moving the lever means to a reservoir outlet seal release position while the predetermined level of fluid remains in the reservoir; and means for retaining the lever means in the seal release position and thereafter releasing the lever means to reconfigure the outlet seal.

Other embodiments include pushing means for pushing the sealing means toward the reservoir exit port sealing position. The reservoir fluid may be, for example, blood, at least partially blood, or any fluid that supplies a living body. Fluid exiting the reservoir may be pressurized. The member is a float and the sealing means includes an arm. The sealing means is a self-aligning seal and a cup-shaped suction disk. The arm may be an elastic member. Other examples include means for preventing arm movement when the fluid is below a predetermined level.

According to another embodiment, an outlet control device for controlling blood flow from a blood collection supply reservoir includes a float means movable in response to a blood level within the reservoir and a lever means including means for sealing the reservoir outlet to a blood method shutoff. , means for moving the lever means to a reservoir outlet seal release position, and maintaining the lever means in the seal release position while a predetermined level of blood remains in the reservoir, after which the lever means is released to reestablish the outlet seal. According to other embodiments, the lever means includes a resilient member. The retention means includes a float means and said lever means which are interengaged while a predetermined level of fluid remains in the reservoir, and below which the float means and lever means are released to reestablish the seal. It further includes means for preventing movement of the lever means when the fluid is below said predetermined level.

It further includes means for actuating said lever moving means. Furthermore.

and means for returning the lever moving means to a pre-actuated position.

The lever moving means includes a pawl that engages a tab on the lever means. Furthermore, it includes means for guiding the movement of the pawl.

The guide means includes a pawl and a tab for releasing the tab. It further includes a restraining means for pressing the lever means towards the reservoir outlet sealing position.

A fluid collection reservoir according to the invention includes a housing with an f:1 inlet, a collection chamber, an outlet, and means for controlling fluid flow from the outlet, the control means being responsive to the level of fluid in the reservoir. lever means including means for causing the fluid to flow through the reservoir outlet; and lever means including lever means for being stationary in the exit seal release position while a predetermined level of fluid remains in the reservoir; and means for retaining the sole in the released position and thereafter releasing the lever means to reconfigure the outlet seal. The lever means is an elastic member. The reservoir may include biasing means for biasing the lever means into the reservoir outlet sealing position.

Embodiments and drawings illustrating the present invention will be described. In each figure, the same reference numerals indicate similar parts or parts.

FIG. 1 shows a multichamber blood collection reservoir 10 according to the present invention, with housing walls 12 . Blood transfer chamber 14. Exit side −
Includes a shelf device 16. The reservoir 10 is shown in its state before use. Collected blood is transferred to chamber 14 from a chamber above chamber 14 .

Although referred to as blood, the collected fluid may be whole blood or at least partially whole blood. Additionally, the fluid may include saline, irrigation fluid,
Fluids such as heparin can be included as required by the physician. The fluid leaving the reservoir is suitable for supplying the entire body to the living body. Although the illustrated example is a multi-chamber blood collection reservoir, a -chamber reservoir can also be used to collect fluids such as blood.

Similarly, reservoir 10 is suitable for processing fluids other than blood. The reservoir IO is further connected to outlet 18. Valve 20° seal ring 22. Rod 24. Blood filter 26. trigger 28
, spring 30. Includes a handle 32. The trigger 28 is pivotally supported on the reservoir 10 by a pin 29, and further engages with the rod 24 at a position not shown. Compression springs other than the illustrated spring 30 can also be used. The spring urges the trigger 28 to the inactive position.

Outlet control device 16 has a number of associated components. The first part is a float 34, which is pivoted to the reservoir by a pin 36. Next is a lever 38 which is pivoted to the reservoir by a pin 40 and includes a valve 42 which engages the outlet 18 and seals it with a valve seat 44. Lever 38
further includes a projecting tab 46. The other part is an actuator 48, which is connected to the rod 24 and connected to the pawl 5 through a pin 51.
0. A pin 52 is connected to the pawl 5o, the pin 52 being in a member 53 having a slot 54, the cooperation of the pin 52 and the slot 54 guiding the movement of the pawl. Finally, spring 56 engages stopper 8-38 to force the lever into the reservoir outlet closing position. Surface 49 of float 34 stops downward movement of actuator 48 in the position of FIG. So 4
While 9 is in contact with the actuator 48, the actuator does not move downward. The outlet seal will not open inadvertently when there is no predetermined level of fluid in the reservoir chamber 14.

Figures 2-5 show the sequence of operation of the reservoir and outlet control device. A person holds the handle 32 in his hand, puts his finger on the trigger 28, and applies a force F to the trigger 28 to bring it into the position shown in FIG. This rotation of trigger 28 about pin 29 compresses spring 30, causing rod 24. Valve 20. Actuator 48. Claw 5
Move 0 downward. Because the seal between valve 20 and seal ring 22 is broken, fluid B, such as blood, flows into chamber 14 from the chamber that previously collected blood above chamber 14 . The blood collected in chamber 14 rises.

The float 34 rotates and rises. Rotation of float 34 rotates surface 49 to a position where surface 49 does not interfere with the downward movement of actuator 48. Actuator 48
A gap is created between the right end of the surface 49 and the surface 49. Pawl 50 engages tab 46 on lever 38, but the lever does not move. valve 42
contacts the valve seat 44 and blocks the outlet 18.

Spring 56 urges lever 38 and valve 42 into the outlet closed position. The valve 42 can also be a cup-shaped disc that is a stop but has self-aligning properties.

In FIG. 3, the release of force F causes a compression spring 30 (not shown) to trigger trigger 28. Rod 24. Valve 20. Actuator 48. The pawl 50 is rotated to the initial position shown in FIG.

The chain between the valve 20 and the sealing ring 22 is reformed and prevents blood from flowing into the chamber 14.
4 increases as the blood level within chamber 14 increases. valve 4
2 and the valve seat 44 is broken, and the 1111 liquid flows into the chamber 14.
The upward movement of the actuator 48 and the pawl 50 causes the upward movement of the pawl 50 to
0 engages tab 46 in FIG.
8 and the lever pivots about the pin 40 to open the outlet 18. After this, the claw 50 and the tab 46 are separated, and the lever 38 is pressed by the spring 56 to move the valve 42 to the valve seat 44.
exerts a force to close the outlet 18.

Details of the operation of pawl 50 and lever 38 are discussed below with reference to Figures 8-11. However, float 34 and lever 38 engage at end 58 to prevent lever 38 from returning to the outlet closed position. Float 34 becomes buoyant due to the level of blood in chamber 14, and end 58 prevents counterclockwise rotation of lever 38 so that the outlet remains open and blood flows out. Transfer chamber 14 is pressurized by means not shown so that fluid exiting outlet port 18 is at or above atmospheric pressure. For example, a port may be provided in wall 12 and a pulse pressure needle, pressure gauge, or line communicated with port 1- to obtain the desired pressure level.

4, the outlet 18 is opened and blood flows out, the blood level in the chamber 14 is reduced, the float 34 and the lever 38 are engaged at the end 58, and the valve 42 is moved back out of the valve seat 44. prevent In FIG. 5, the blood level in chamber 14 has further decreased and float 34 and lever 38 are engaged at end 58;
Open exit 18. The engagement of the float and lever at end 58 is just before release. In FIG. 6, float 34 and lever 38 are not engaged at end 58, and lever 38 is pivoted by spring 56 to seat valve 42 in valve seat 44 and close outlet 18. The blood level is above the closed outlet boat and no air enters through the outlet 18.

Repeat the sequence of Figures 2-6.

FIG. 7 shows another embodiment of the outlet control device 16.

The figure shows the exit control device 16゛, float 34゛, float pivot pin 36゛, lever 38゛, and tab 46゛.
, the actuator movement inhibiting surface 49', the float 34', and the engagement position 58' of the lever 38'. The lever 38'' is an elastic member such as a leaf spring, and the rivet 6
Connect to the reservoir by 0. The actuator 48 and pawl 50 engage the movement tab 46' to open the outlet boat 18 and raise the lever 3ε (') if the level of blood B decreases there.

Flow 1-34' rotates clockwise about pin 36'. At position 58', the triangular portion 62 of the float 34'' and the triangular portion 64 of the resilient member 38' are in sliding contact to maintain the outlet bow 8 in the open position, and the lever 38' is held in the position shown. When '' falls as the blood level decreases, sections 62,64 separate and lever 38' is released from its raised position and moves downwardly, causing valve 42 to contact valve seat 44 and close outlet port 18.
Stop the flow of blood. The fluid level is above the closed exit boat. The cycle of filling and draining the transfer chamber 14 is now restarted.

Figures 8-11 illustrate the actuation of the pawl to engage and release the lever arm. The diagram shows the nail from right to left. In FIG. 8, the pawl 50 is the first
It is in the position shown in the figure, before the claw is activated. The downward and outward movement of pawl 50 is controlled by the movement of pin 52 moving along slot 54. FIG. 9 shows just before the claw 50 engages with the tab 46, and the one-dot line indicates launch engagement with the tab 46. 10th
Pawl 50 is shown just before engaging tab 46 and moving upwardly. Pawl 50 latches onto tab 46 and moves upwardly displacing lower arm 38 and opening outlet port 18. 11th
The figure shows the pivoting movement of pawl 50 and its release from tab 46. The lever 38 is basically in the position shown in FIG. The pawl 50 continues its upward movement and returns to any of the positions shown in Figures L3-8 of Figures 6J.

The invention has been described in terms of preferred embodiments. The present invention can be modified in various ways, and the embodiments and drawings are illustrative and do not limit the invention.

[Brief explanation of drawings]

1 is a sectional view showing the blood outlet section of the blood collection reservoir according to the invention and the rest position of the blood flow control device; FIG.
Figure 5 is a cross-sectional view of the sequence of the process of introducing blood into the outlet port and the process of blood flowing out from the outlet boat in the device of Figure 1, and Figure 6 shows the sequence in which the blood level rises above the outlet when blood has finished flowing out. Certain cross-sectional views, FIG. 7, are similar to FIG. 4 but show another embodiment of the control device, and FIGS. 8-11 are partially enlarged views showing the operation of the exit boat opening structure. 100. Blood Collection Reservoir 140. Blood transfer chamber 168
．． Out [1 Control device 180. Exit 200. Valve 289
．． Trigger 341. Flow 1-38. , lever 420.
Valve 44. Valve seat 460. Tab 486. Actuator 501. Claw 540. slot 15-'

Claims (1)

Claims: 1. A fluid collection reservoir comprising a housing having an inlet, a collection chamber, an outlet, and means for controlling fluid flow from the outlet, the control means controlling the flow of fluid in the reservoir. lever means including float means responsive to the level; means for sealing fluid flow through the reservoir outlet; and means for moving the lever means to a reservoir outlet seal release position; and means for retaining the means in a seal release position and thereafter releasing the lever means to reconfigure the outlet seal. 2. The reservoir according to claim 1, wherein said lever means includes an elastic member. 3. said retaining means includes float means and said lever means interengaged while a predetermined level of fluid remains in the reservoir;
2. The reservoir of claim 1, wherein below a predetermined level, the float means and lever means are released to reestablish the seal. 4. The reservoir of claim 1 further comprising means for preventing movement of the lever means when the fluid is below said predetermined level. 5. The reservoir of claim 1 further comprising means for actuating said lever moving means. 6. The reservoir of claim 5 further comprising means for returning the lever moving means to a pre-actuation position. 7. The reservoir according to claim 6, wherein the lever moving means includes a pawl for engaging a tab provided on the lever means. 8. Claim 7 further comprising means for guiding the movement of the claw.
Reservoir as described. 9. The reservoir of claim 8, wherein said guide means includes a pawl and means for releasing the tab. 10. The reservoir of claim 1, further comprising pressing means for pressing the lever means towards the reservoir outlet sealing position.